This works great with the pigtails you use for battery maintenance. Just plug it in and it will show you how many volts you have in your battery. It usually reads 13.2V after I unplug and plug the battery conditioner back in. After a few days without a battery conditioner it shows 12.8V. It's great to be able to read the voltage of your battery. You can also use the USB plug to charge your devices. I am very satisfied as it is well made and looks good.
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